Question: When did Turku have the population of 159180?
Paraphrase: Turku had 159,180 people at which period of time?
SPARQL (Wikidata): SELECT ?value WHERE { wd:Q38511 p:P1082 ?s . ?s ps:P1082 ?x filter(contains(?x , '159180.0')) . ?s pq:P585 ?value}